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Separating electrons and donors in BaSnO3 via band engineering
DOI:
10.1021/acs.nanolett.9b03825
Authors:
Abhinav
Prakash
(University of Minnesota)
,
Nicholas F.
Quackenbush
(National Institute of Standards and Technology)
,
Hwanhui
Yun
(University of Minnesota)
,
Jacob T.
Held
(University of Minnesota)
,
Tianqi
Wang
(University of Minnesota)
,
Tristan
Truttmann
(University of Minnesota)
,
James M.
Ablett
(Synchrotron SOLEIL)
,
Conan
Weiland
(National Institute of Standards and Technology)
,
Tien-Lin
Lee
(Diamond Light Source)
,
Joseph C.
Woicik
(National Institute of Standards and Technology)
,
K. Andre
Mkhoyan
(University of Minnesota)
,
Bharat
Jalan
(University of Minnesota)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Nano Letters
State:
Published (Approved)
Published:
November 2019
Diamond Proposal Number(s):
15845
Abstract: Separating electrons from their source atoms in La-doped BaSnO3, the first perovskite oxide semiconductor to be discovered with high room-temperature electron mobility, remains a subject of great interest for achieving high-mobility electron gas in two dimensions. So far, the vast majority of work in perovskite oxides has focused on heterostructures involving SrTiO3 as an active layer. Here we report the demonstration of modulation doping in BaSnO3 as high room temperature mobility host without the use of SrTiO3. Significantly, we show the use of angle- resolved hard X-ray photoelectron spectroscopy (HAXPES) as a non-destructive approach to not only determine the location of electrons at the buried interface but also to quantify the width of electron distribution in BaSnO3. The transport results are in good agreement with the results of self-consistent solution to one-dimensional Poisson and Schrödinger equations. Finally, we discuss viable routes to engineer two-dimensional electron gas density through band-offset engineering.
Journal Keywords: Modulation doping; charge transfer; band alignment; alkaline-earth stannate; transparent conductor; wide band gap material
Diamond Keywords: Semiconductors
Subject Areas:
Chemistry,
Materials,
Physics
Instruments:
I09-Surface and Interface Structural Analysis
Added On:
11/11/2019 09:51
Discipline Tags:
Surfaces
Physics
Physical Chemistry
Chemistry
Materials Science
interfaces and thin films
Perovskites
Metallurgy
Technical Tags:
Spectroscopy
X-ray Photoelectron Spectroscopy (XPS)
Hard X-ray Photoelectron Spectroscopy (HAXPES)